package test;

import java.util.Scanner;

/**
 * @author 郝文雪
 * @date 2022/9/14 22:52
 * @Description Test
 */
public class guang2 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr=new int[3];
        for(int i=0;i<3;i++){
            arr[i]=sc.nextInt();
        }
        System.out.println(find(arr));
    }

    private static int find(int[] arr) {
        if(arr.length==0){
            return 0;
        }
        return -1;
    }
}
